CN108491599A - A kind of mixed type filler swelling property evaluation method for railway bed - Google Patents
A kind of mixed type filler swelling property evaluation method for railway bed Download PDFInfo
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Abstract
The invention discloses a kind of mixed type filler swelling property evaluation method for railway bed, this method has following steps：Mixture expansion rate computation model is built, the expansion rate of current road segment mixed type filler is obtained based on mixture expansion rate computation model, further according to the expansion effects depth of the affiliated region of railway bed, further calculates out the expansion evaluation height in the section；Expansion evaluation height is compared with preset standard swell increment, if adjusting one or more parameters for influencing expansion evaluation height more than if, until expansion evaluation height is less than standard swell increment.The present invention improves the integrality and accuracy of mixed type filler swelling property evaluation, provides dilatancy Adjusted Option for the engineering performances of high-speed rail transportation, and provide specifically directive significance for its implementation.
Description
Technical field
The present invention relates to Subgrade Packing fields, specifically, being to be related to a kind of mixed type for railway bed to fill out
Expect swelling property evaluation method.
Background technology
In the miniature deformation of railway transport field, roadbed tremendous influence can be generated to the stationarity of circuit.It is especially tight
Cold area, hot area and extreme weather area, the dilatancy of roadbed seriously affect the comfort level and road knot of train
The durability and persistence of structure are the basic engineerings for ensureing train driving safety.Therefore, the expansion of roadbed embankment material is studied
Sex chromosome mosaicism has great importance for the railway construction and maintenance in regular extreme weather area.
In common railway especially high-speed railway field, roadbed embankment material has higher stability requirement, a side
Face remains to keep stablizing under the effect of the gravity load of the effect of train load and track and road structure, it is also necessary to meet
Its mechanical characteristic is not easy to be influenced by the outer force effect such as water, temperature, operation pressure, train load, earthquake.In general, roadbed filling
Material use mixed type filler, mainly by coarse granule skeleton, skeleton filler material and residual pore form, in general,
The fine grained filler that contains in filler material is met water and can be expanded, as fine grained filler material volume increases, in macroscopically then body
It is now the expansion process of mixed type filler (mixture).
In general, distinguishing that the dilatancy classification of filler soil is the premise of expansion evaluation.In the prior art, some are using expansion
Amount grade is evaluated, some are using calculated expansion rate as Appreciation gist.It is right since the influence factor of soil expansion is various
Water and weather conditions are very sensitive, and soil expansion was not only related with by in-site measurement or calculated expansion height, but with reflection
The expansion rate of soil body relative expansion amount is related so as to expansile evaluation, there are the following problems：If one timing of expansion rate, because of it
Related with expansion height, the soil body of this area may determine that weak expansive soil grade, but it is more than mark that actually it, which expands deformation quantity,
Quasi- value, can produce a very large impact circuit stationarity；To being evaluated as the area of strong swelling soil grade, if expansion height is smaller, its is swollen
Bulging becomes will not be to the whole stationarity of influence circuit.Therefore, when evaluating dilatancy, the nothing if only considering single influence factor
Method reflects the true expansion status of filler comprehensively.In addition, being related to for the method for adjustment after swelling property evaluation is also rare.
Invention content
In order to solve the above technical problem, the present invention provides a kind of mixed type filler dilatancy for railway bed to comment
Valence method, this method have following steps：Expansion height calculates step, builds mixture expansion rate computation model, based on described
Mixture expansion rate computation model obtains the expansion rate of current road segment mixed type filler, further according to the swollen of the affiliated region of railway bed
Swollen influence depth further calculates out the expansion evaluation height in the section；Expansion height evaluation procedure is evaluated the expansion high
Degree is compared with preset standard swell increment, if the ginsengs for adjusting one or more influences expansion evaluation height more than if
Number, until expansion evaluation height is less than the standard swell increment.
Preferably, in the expansion height calculates step, it is based on mixed type filler frost heave prediction model, according to mixed type
The vertical coefficient of expansion of the filler in expansion process, the rebound coefficient and moisture conductance after compacting, and combine belonging to railway bed
The evaporation rate of region establishes mixture expansion rate computation model.
Preferably, in the expansion height evaluation procedure, the affecting parameters of the expansion evaluation height include mixed type
Rebound coefficient, fine grained filler material content, mixed type filler moisture content, mixed type packing density, Yi Jisuo after filling compaction
State expansion effects depth.
Preferably, the expansion height evaluation procedure further comprises, when expansion evaluation height is more than the standard
When swell increment, using preset dilatancy Grade Model, the swelling property evaluation grade of mixed type filler, the expansion evaluation are determined
Grade include extremely weak microdilatancy, weak microdilatancy, in lower microdilatancy, in upper microdilatancy, strength micro expansion and extremely strong microdilatancy；According to working as
The preceding swelling property evaluation grade, using preset dilatancy regulation mechanism, to influencing current road segment mixed type filler dilatancy
Principal element be adjusted so that expansion evaluation height is less than the standard swell increment.
Preferably, in the swelling property evaluation magnitude step for determining mixed type filler, further comprise, determine each dilatancy
The range of mixture expansion rate in opinion rating；It is commented if the mixture expansion rate of current road segment meets the corresponding dilatancy
The range of the mixture expansion rate in valence grade, then using the grade as the evaluation expansile grade of current rail roadbed.
Preferably, influence is being worked as using preset dilatancy regulation mechanism according to presently described swelling property evaluation grade
The preceding expansile principal element of section mixed type filler is adjusted in step, when the swelling property evaluation grade is extremely weak micro- swollen
When swollen or weak microdilatancy, the expansion effects depth in adjustment expansion evaluation height affecting parameters.
Preferably, influence is being worked as using preset dilatancy regulation mechanism according to presently described swelling property evaluation grade
The preceding expansile principal element of section mixed type filler is adjusted in step, in the swelling property evaluation grade is under it is micro- swollen
It is swollen or in upper microdilatancy when, the expansion effects depth in adjustment expansion evaluation height affecting parameters, or choose arbitrary
Rebound coefficient, fine grained filler material content, mixed type filler moisture content and mixed type packing density after being compacted including mixture
Mixture expansion rate affecting parameters be adjusted.
Preferably, influence is being worked as using preset dilatancy regulation mechanism according to presently described swelling property evaluation grade
The preceding expansile principal element of section mixed type filler is adjusted in step, when the swelling property evaluation grade is strength micro expansion
Or when extremely strong microdilatancy, following one or more measures are further improved：The measure of bedding water proof, bedding Insulation and bedding are anti-
Deformation measure.
Preferably, in the expansion height calculates step, the mixture expansion rate meter is indicated using following expression
Calculate model：
Wherein, ηIt is mixedIndicate that mixed type filler expansion rate, f indicate that the rebound coefficient after mixed type filling compaction, k indicate mixing
The moisture conductance of type filler, υ indicate the evaporation rate of mixed type filler,Indicate the vertical expansion system when expansion of mixed type filler
Number, ρIt is mixedIndicate that mixed type packing density, θ indicate fine grained filler material content, dsIndicate the weight ratio of mixed type filler and water,α indicates that filler material frozen-heave factor, β indicate the filling rate of mixed type filler, β0Indicate mixed
The initial filling rate of mould assembly filler, ρwIndicate that the density of water, w indicate mixed type filler moisture content, GSkeletonIndicate thick in skeleton
Grain accounts for the weight ratio of mixed type filler.
Preferably, in adjustment expands the expansion effects depth step in evaluation height affecting parameters, by the mark
Quasi- swell increment evaluates height as presently described expansion, according to the mixture expansion rate currently having calculated that, is corresponded to
Expansion effects depth standard value, and using the standard value as the updated expansion effects depth.
Compared with prior art, one or more of said program embodiment can have the following advantages that or beneficial to effect
Fruit：
The present invention is corrected mixture expansion rate computation model, improves the comprehensive of soil expansion evaluation,
Revised expansion rate is combined when evaluation expands evaluation height parameter, improves expansile evaluation reference factor, essence
The thin inflation level for having divided soil body filler, a kind of expansile side of new evaluation is provided for the engineering performances of high-speed rail transportation
Method.
Other advantages, target and the feature of the present invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.The target and other advantages of the present invention can be wanted by following specification, right
Specifically noted structure is sought in book and attached drawing to realize and obtain.
Description of the drawings
Attached drawing is used to provide further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
It applies example and is used together to explain the present invention, be not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the step flow of the mixed type filler swelling property evaluation method for railway bed of the embodiment of the present application
Figure.
Specific implementation mode
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, how to be applied to the present invention whereby
Technological means solves technical problem, and the realization process for reaching technique effect can fully understand and implement.It needs to illustrate
As long as not constituting conflict, each embodiment in the present invention and each feature in each embodiment can be combined with each other,
It is formed by technical solution within protection scope of the present invention.
The embodiment of the present invention is intended to form a kind of mixed type filler swelling property evaluation method for railway bed, this method
It will be modified based on existing frost heave prediction model, and obtain mixture expansion rate computation model, calculated by the model current
Expansion rate after the engineering performances in section recycles expansion height judgement schematics and expansion rate Grade Model, establishes for swollen
The appraisal procedure of swollen type variable is realized to the expansile complete evaluation of mixed type filler.
Fig. 1 is the step flow of the mixed type filler swelling property evaluation method for railway bed of the embodiment of the present application
Figure.As shown in Figure 1, in step s 110 (expansion height calculating step), mixture expansion rate computation model is built, based on mixing
Material expansion rate computation model obtains the expansion rate of current road segment mixed type filler, is obtained further according to the affiliated Regional Property of railway bed
Expansion effects depth, calculate the section expansion evaluation height.Wherein, it needs mixture expansion rate and expansion effects is deep
Degree makees multiplying (expansion height evaluation calculation formula), to obtain to evaluate the expansile core ginseng of mixed type filler
Number --- expansion evaluation height.
Specifically, in step S110, it is based on existing mixed type filler frost heave prediction model, according to mixed type filler
The moisture conductance of the rebound coefficient and mixed type filler after the vertical coefficient of expansion, mixed type filling compaction in expansion process,
And with reference to the evaporation rate of the affiliated region of railway bed, further establish mixture expansion rate computation model.Below first to mixed type
The building process of filler frost heave prediction model illustrates.
First, being filled up completely in situation in mixed type filler process of frost heave, since the residual pore rate in the soil body is direct
Decide the internal resolution ability to frost heave, when under low-temperature condition frost heave occurs for filler material, if filling up residual pore first,
Then just promote the macroscopic view expansion of mixture, then, macroscopical frost heave at this time is its minimum state.Process of frost heave therein is practical
It is fine grained filler material in mixed type filler, the coarse granule in mixed type filler is not swollen, and coarse granule is also rigid body, but thin
Grain low temperature frost heave.The volume components of fine grained filler material are soil particle and moisture herein, and filler material and residual pore constitute mixed
The matrix porosity of mould assembly filler, when fine grained frost heave, a part of water migrates out, it is assumed that filler particle direct expansion comes
Simulating actual conditions filler particle adsorbed water molecule expands, to study the case where mixed type filler is filled up completely.For mixed
Mould assembly filler is filled up completely model, there is theoretical relationship：△VMixed type filler=△ VFiller material-(VMatrix porosity-VFiller material), wherein △ VMixed type filler
Indicate the volume change after mixed type filler entirety frost heave, △ VFiller materialIndicate the volume change after filler particle frost heave,
VMatrix porosityIndicate the volume of matrix porosity, VFiller materialIt indicates the volume of filler particle, is based on this, it is real in the interior after over sampling
It tests, according to interaction relationship derives mixed type filler frost heave between filler material frost heave and skeleton particle in mixture process of frost heave
Prediction model.The model describe the macroscopic view expansion of mixed type filler is swollen with mixed type packing density, filler material content, filler material
Coarse granule in swollen rate, mixed type filler proportion, the density of water, mixed type filler moisture content and skeleton accounts for mixed type filler
Weight ratio (skeleton proportion) has close relationship, actual frozen-heave factor that can be higher than the value.Following expression can be utilized to indicate
The model：
ξMixed (first)=ξ (ρIt is mixed, θ, α, ds, ρω, w, GSkeleton)
Wherein, ξMixed (first)It indicates in the frozen-heave factor for being filled up completely mixed type filler, ρIt is mixedIndicate mixed type packing density,
θ indicates that fine grained filler material content, α indicate filler material frozen-heave factor, dsIndicate the weight proportion (mixed type of mixed type filler and water
Filler proportion, specifically, the weight ratio value of water when referring to 4 DEG C of mixed type filler weight and same volume), ρwIndicate the density of water, w
Indicate mixed type filler moisture content, GSkeletonIndicate that the coarse granule in skeleton accounts for the weight ratio (skeleton proportion) of mixed type filler.
Then, the not completely filled situation to mixed type filler process of frost heave is needed to analyze.What is used in engineering is mixed
Frost heave can occur for filler material in mould assembly filler filler material fine grained aqueous at low temperature, as filler material volume increases, and
Unexpansive volume takes the skeleton that residual pore is lifted mixed type filler again.In fact, when frost heave occurs, filler material is not complete
The resistance that filling skeleton residual pore encounters can promote it to be lifted skeleton, in the frost heave mistake for being macroscopically presented as mixed type filler
Journey.At this point, △ VFiller material=△ VMixed type filler+△VIt squeezes out, wherein △ VIt squeezes outIndicate filler material some filler quilt in expansion process
Squeeze into the volume in adjacent pores.Further, it if establishing the not completely filled physics rheological model of mixture frost heave, needs with filling
Rate indicates filling operation, is defined as the ratio of filler material volume and matrix porosity volume, i.e. β=△ VCasting resin/VMatrix porosity, utilizing
Conservation of energy principle and mathematical relationship solving model, derive filling rate relational expressionWherein,
β indicates that not completely filled degree (filling rate of mixed type filler), N indicate that overlying burden, C indicate filler material cohesive strength,Table
Show fine grained angle of friction, β0Indicate the initial filling rate of mixed type filler.Therefore, filling rate parameter is frozen with overlying burden, filling
Swollen rate, filler material cohesive strength, fine grained angle of friction, initial filling rate parameter have substantial connection.
Finally, it will be filled up completely theoretical model and incomplete theoretical model based on existing combination mixed type filler, that is, examined
Consider be fully populated with and lifting effect influence each other, be based on maximum energy criterion, be deduced mixed type filler frost heave prediction
Model.At the beginning of the model is plastically deformed angle of friction, filler material cohesive strength, filler material frozen-heave factor, mixture with overlying burden, filler material
Beginning filler material filling matrix porosity degree (not completely filled degree), mixed type filler proportion, the density of water, mixed type filler contain
Water rate, mixed type packing density, fine grained filler material content and skeleton proportion have close relationship, and utilize expression formula table
Show：
Wherein, ξIt is mixedIndicate the frozen-heave factor of mixed type filler.
After having obtained mixed type filler frost heave prediction model, which is optimized, due to relative to process of frost heave
For, the expansion process of mixed type filler considers mixed type without the limitation of low-temperature condition compared with original frost heave model
Lateral shrinkage, elastic deformation and the influence of evaporation effect of filler, expand original model when the wet guilding of filler, expansion
The scope of application.Specifically, first, the rebound coefficient after mixed type filling compaction is related with the self property of mixed type filler, can
It is measured by compact test.After filler padding and compacting, partial blend is in elastic deformation state, removes or reduces in load
Flexible deformation will produce rebound or recovery afterwards, cause volume expansion, when calculating bulk expansion rate, need to consider this parameter
It influences.Second, due to the presence of capillarity, moisture can conduct from bottom to top, and different filler water transmitting abilities is different, holds
Outlet capacity also differs, so needing to be multiplied by moisture conductance to moisture content on the basis of original process of frost heave, moisture conductance can
It is measured by indoor saturation testing.Third, since climatic environment is different along roadbed, surface evaporation effect also differs, real
Border moisture content should be less than indoor moisture content, so should subtract evaporation rate on original frost heave model, different regions evaporation rate can lead to
Excessive ground meteorological department announces data or actual measurement obtains.4th, when mixed type filler expands, due to being acted on by overlying load
Influence, other than vertically expanding, and can be deformed to lateral expansion, i.e., vertical swell increment should be less than calculated value, so
It is also necessary to take into account that the vertical coefficient of expansion, the vertical coefficient of expansion can be surveyed by indoor expansion test on the basis of original frost heave model
.Therefore, mixture expansion rate computation model is indicated using following expression：
It is further represented as：
Wherein, ηIt is mixedIndicate that mixed type filler expansion rate, f indicate that the rebound coefficient after mixed type filling compaction, k indicate mixing
The moisture conductance of type filler, υ indicate the evaporation rate of mixed type filler,Indicate the vertical expansion system when expansion of mixed type filler
Number, so as to complete the foundation of mixture expansion rate computation model.It should be noted that since the model is without to mixed type
The low temperature of filler frost heave prediction model limits, therefore parameter alpha is then changed to indicate filler material expansion rate.Mixture expansion rate calculates mould
Type is not only related with the affecting parameters in mixed type filler frost heave prediction model, also with the moisture conductance of mixed type filler, expansion
The evaporation rate of rebound coefficient and the affiliated region of current rail roadbed after the vertical coefficient of expansion in the process, compacting is related.
Referring again to FIGS. 1, when height is evaluated in the expansile expansion of Calculation Estimation mixed type filler, expansion effects therein
Depth parameter and the weather of the affiliated region of railway bed, soil body humidity, related, the Ke Yitong that uploads the factors such as load, soil body soil property
It crosses《Railway bed design specification》It finds.In addition, the expansion effects depth parameter of each department soil body can also be measured by practical or
Local meteorological, geology department understands to obtain.In Practical Project, if desired expansion effects depth parameter is adjusted, specifically
Ground, can using foundation bed structure practical filling height or take Insulation and adjust this parameter.In following table 1
0.4m, 0.7m, 1.5m, 2m, 2.5m, 3m are exactly successively the sum of accumulation of each layer height of foundation bed structure, up to 3m, that is,
Say no matter the expansion effects depth value in external environment has much, and the influence maximum to bulk expansion can reach 3m.
Then, classification schemes are expanded according to existing Subgrade Packing, determines the standard swell increment of mixed type filler, at this
It, will be from example《Design of High-speed Railway specification》Specified in be enough to influence the expansion height lower limiting value 4mm of safe railway operation
As standard swell increment, the application is not especially limited the parameter.In actual application, the main track of circuit is repaired to hair
Two strands of station track road rail horizontal plane is actual expansion height, i.e., (parameter utilizes expansion height evaluation meter to expansion evaluation height
Formula is calculated to obtain), which is not greater than above-mentioned standard swell increment.Expansion evaluation height is indicated below with following formula：
△ h=ηIt is mixed·h
Wherein, △ h indicate that expansion evaluation height, h indicate expansion effects depth., it can be seen that structure expansion from above formula
Rate computation model improves the integrality of the expansile evaluation of mixed type filler so that the engineering parameter for influencing expansion rate also can
Influence the expansile evaluation of filler.Therefore, when being adjusted to dilatancy, expansion effects depth can both be adjusted, additionally it is possible to
Adjust expansion rate impact factor.
Referring again to FIGS. 1, after height is evaluated in the expansion for completing current road segment, (expansion height in step S120 is entered
Evaluation procedure).In step S120, calculated expansion evaluation height is compared with preset standard swell increment, if
More than one or more parameters for influencing expansion evaluation height are then adjusted, until expansion evaluation height is less than standard swell increment.Its
In, expansion evaluation height affecting parameters include rebound coefficient, fine grained filler material content, the mixed type filler after mixture compacting
Moisture content, mixed type packing density and expansion effects depth.
Specifically, when expansion evaluation height is above standard swell increment, obtain the mixture expansion rate of current road segment with it is swollen
Swollen influence depth determines the swelling property evaluation grade of mixed type filler using preset dilatancy Grade Model.Wherein, it expands
Opinion rating include extremely weak microdilatancy (6 grades), weak microdilatancy (5 grades), in lower microdilatancy (4 grades), in upper microdilatancy (3 grades), strong
Microdilatancy (2 grades) and extremely strong microdilatancy (1 grade).Join it should be noted that dilatancy Grade Model had both included expansion effects depth
Several grades, and include the grade of mixture expansion rate, wherein the experience range value of the two parameters is respectively divided into identical
The product of the section of series, the maximum swelling influence depth parameter in each section and maximum mixture expansion rate meets less than above-mentioned
The principle of standard swell increment.Wherein, table 1 is a specific example of the dilatancy Grade Model after dividing, and the application is to expansion
Property Grade Model in the interval range of each parameter be not especially limited.
1 dilatancy Grade Model of table
In conclusion the dilatancy Grade Model only considers the evaluation of fine particle content and water content of soil compared to tradition
Classification schemes add rebound coefficient after mixture pressure, fine grained filler material content, mixed type filler moisture content, mixed type and fill out
Expect multiple influence factors such as density and expansion effects depth.
In the swelling property evaluation level procedure of above-mentioned determining mixed type filler, firstly, it is necessary to by ranking score shown in table 1
Class form determines the range of mixture expansion rate and expansion effects depth in each swelling property evaluation grade.Then, if getting
The mixture expansion rate of current road segment meet the range of mixture expansion rate in corresponding swelling property evaluation grade, then by the grade
As the expansile opinion rating of current rail roadbed.
Then, after determining completion swelling property evaluation grade, according to current swelling property evaluation grade, preset structure is utilized
The dilatancy regulation mechanism built is adjusted respectively to influencing the expansile principal element of current road segment mixed type filler so that
Expansion evaluation height reaches the range less than standard swell increment.
(first example) is extremely weak microdilatancy (6 grades) or weak microdilatancy (5 when calculated current mixture expansion rate
Grade) when, the expansion rate of mixed type filler itself is smaller, and swelling property evaluation grade is then judged as extremely weak microdilatancy (6 grades) or weak micro-
It expands (5 grades), at this point it is possible to adjust the expansion effects depth parameter in expansion evaluation height affecting parameters.In particular it is required that will
Above-mentioned standard swell increment utilizes expansion height as current expansion evaluation height according to current calculated mixture expansion rate
Calculation formula is evaluated, inverse goes out the standard value of corresponding expansion effects depth, and using the standard value as updated expansion shadow
Ring depth parameter.Further, according to updated expansion effects depth value, the filling height of Practical Project foundation bed structure is adjusted,
So that final expansion evaluation height is less than standard swell increment.Furthermore it is also possible to implement to reduce inside outside atmosphere and bedding into
The bedding Insulation of row heat exchange realizes the control to expansion effects depth parameter.
(second example) in calculated current mixture expansion rate is lower microdilatancy (4 grades) or in upper microdilatancy (3
Grade) when, the mixed type filler expansion rate of itself belongs to medium, the lower microdilatancy (4 in being then judged as of (current) swelling property evaluation grade
Grade) or in upper microdilatancy (3 grades), at this point it is possible to complete expansion evaluation height parameter by any one or more following mode
Adjusting.First, adjusting expansion effects depth parameter according to the method described above according to on-site actual situations.Second, choosing arbitrary
Rebound coefficient, fine grained filler material content, mixed type filler moisture content and mixed type packing density after being compacted including mixture
Equal mixtures expansion rate affecting parameters are adjusted.It should be noted that rebound coefficient after mixture compacting in this example, thin
Granule filling material content, mixed type filler moisture content and mixed type packing density are only the specific of mixture expansion rate affecting parameters
Example, those skilled in the art can adjust in mixture expansion rate computation model according to actual demand can influence expansion rate calculating
As a result any parameter, the application are not especially limited the parameter that can influence mixture expansion rate.Third, by mixing
The water translocations measure such as salting in type filler changes the interaction between water and grogs by salinity, and reaching makes in the soil body
Water translocation intensity changes, and reduces expansion rate.Fourth, suitably adjusting foundation bed structure, such as add pumping equipment.Needle below
The method being adjusted to each expansion rate affecting parameters is specifically described：
First, adjust mixture rebound coefficient：Elastic deformation state after being compacted based on mixture, is tried by indoor compacting
It tests, chooses the smaller mixture of rebound coefficient, the parameter value after variation is substituted into again in mixture expansion rate computation model, is obtained
To updated expansion rate, until within the expansion ratio range for the permission that expansion rate is decreased to corresponding grade, until expansion evaluation
Height is less than standard swell increment.
Second, adjust mixture moisture content：The moisture content for gradually reducing mixture by a certain percentage, accordingly reduces fine grained
Parameter value after variation is substituted into mixture expansion rate computation model, obtains updated expansion by filler material expansion rate again
Rate, and the expansion evaluation height of current road segment is recalculated, until expansion evaluation height is less than within the scope of standard swell increment.
Third adjusts mixed type packing density：By indoor screen experiments, the grading of mixture is adjusted, is gradually reduced mixed
Material grading unevenness is closed, filler porosity is increased, it is corresponding to reduce mixed type packing density, by the parameter value after variation again generation
Enter in mixture expansion rate computation model, until expansion rate be decreased to accordingly expand evaluation height allow expansion ratio range it
It is interior.
4th, adjust fine grained filler material content：By indoor screen experiments, scales down fine grained casting resin and contain
Amount, the corresponding pack completeness for reducing fine grained filler material, mixture expansion rate computation model is substituted by the parameter value after variation again
In, until obtaining the expansion evaluation height for meeting standard swell increment.
(third example) is strength micro expansion (2 grades) or extremely strong microdilatancy (1 when calculated current mixture expansion rate
Grade) when, the expansion rate of mixed type filler itself is larger, (current) swelling property evaluation grade be then judged as strength micro expansion (2 grades) or
Extremely strong microdilatancy (1 grade) needs further to improve following one or more measures.First, prevent underground and surface water from entering
Bedding water proof measure.Second, it reduces outside atmosphere and carries out the bedding Insulation of heat exchange inside bedding.Third, using base
The anti-deformation related measure of bed, optimizes road structure, enhances the ability of anti-deformation of foundation bed structure.
The present invention proposes a kind of swelling property evaluation method for mixing filler material for railway subgrade works, complete
After the amendment of pairs of existing frost heave prediction model, expansion rate prediction model is constructed, the program improves the expansion of mixed type filler
Property evaluation integrality and accuracy, while the dilatancy level adjustment plan proposed based on the dilatancy Grade Model that has built
Slightly, specifically directive significance is provided for the implementation of reclamation work.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope disclosed by the invention, the change or replacement that can be readily occurred in should all be contained any those skilled in the art
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of mixed type filler swelling property evaluation method for railway bed, which is characterized in that this method has following step
Suddenly：
Expansion height calculates step, builds mixture expansion rate computation model, is obtained based on the mixture expansion rate computation model
It is further calculated to the expansion rate of current road segment mixed type filler further according to the expansion effects depth of the affiliated region of railway bed
Go out the expansion evaluation height in the section；
Expansion evaluation height is compared with preset standard swell increment, is adjusted if more than if by expansion height evaluation procedure
Whole one or more parameters for influencing the expansion evaluation height, until expansion evaluation height is less than the standard and expands
Amount.
2. evaluation method according to claim 1, which is characterized in that in the expansion height calculates step, based on mixed
Mould assembly filler frost heave prediction model, according to the vertical coefficient of expansion of the mixed type filler in expansion process, the rebound system after compacting
Number and moisture conductance, and the evaporation rate of the affiliated region of railway bed is combined, establish mixture expansion rate computation model.
3. evaluation method according to claim 1, which is characterized in that described swollen in the expansion height evaluation procedure
The affecting parameters of swollen evaluation height include that rebound coefficient after mixed type filling compaction, fine grained filler material content, mixed type are filled out
Expect moisture content, mixed type packing density and the expansion effects depth.
4. evaluation method described in any one of claim 1 to 3, which is characterized in that the expansion height evaluation procedure
Further comprise,
When expansion evaluation height is more than the standard swell increment, using preset dilatancy Grade Model, mixing is determined
The swelling property evaluation grade of type filler, the expansion opinion rating include extremely weak microdilatancy, weak microdilatancy, in lower microdilatancy, in
Upper microdilatancy, strength micro expansion and extremely strong microdilatancy；
According to presently described swelling property evaluation grade, using preset dilatancy regulation mechanism, to influencing current road segment mixed type
The expansile principal element of filler is adjusted so that the expansion evaluation height is less than the standard swell increment.
5. evaluation method according to claim 4, which is characterized in that in the swelling property evaluation grade for determining mixed type filler
In step, further comprise,
Determine the range of mixture expansion rate in each swelling property evaluation grade；
If the mixture expansion rate of current road segment meets the mixture expansion rate in the corresponding swelling property evaluation grade
Range, then using the grade as evaluation the expansile grade of current rail roadbed.
6. evaluation method according to claim 4 or 5, which is characterized in that according to presently described swelling property evaluation grade,
Using preset dilatancy regulation mechanism, step is adjusted to influencing the expansile principal element of current road segment mixed type filler
In,
When the swelling property evaluation grade is extremely weak microdilatancy or weak microdilatancy, in adjustment expansion evaluation height affecting parameters
The expansion effects depth.
7. the evaluation method according to any one of claim 4~6, which is characterized in that according to presently described dilatancy
Opinion rating, using preset dilatancy regulation mechanism, to influence the expansile principal element of current road segment mixed type filler into
In row set-up procedure,
When lower microdilatancy during the swelling property evaluation grade is or in upper microdilatancy when, in adjustment expansion evaluation height affecting parameters
The expansion effects depth, or
Choose arbitrary including after mixture compacting rebound coefficient, fine grained filler material content, mixed type filler moisture content and
The mixture expansion rate affecting parameters of mixed type packing density are adjusted.
8. the evaluation method according to any one of claim 4~7, which is characterized in that according to presently described dilatancy
Opinion rating, using preset dilatancy regulation mechanism, to influence the expansile principal element of current road segment mixed type filler into
In row set-up procedure,
When the swelling property evaluation grade is strength micro expansion or extremely strong microdilatancy, one or more as follows arrange further is improved
It applies：The measure of bedding water proof, bedding Insulation and the anti-deformation measure of bedding.
9. evaluation method according to claim 2, which is characterized in that in the expansion height calculates step, using such as
Lower expression formula indicates the mixture expansion rate computation model：
Wherein, ηIt is mixedIndicate that mixed type filler expansion rate, f indicate that the rebound coefficient after mixed type filling compaction, k indicate that mixed type is filled out
The moisture conductance of material, υ indicate that the evaporation rate of mixed type filler, θ indicate the vertical coefficient of expansion when expansion of mixed type filler, ρIt is mixedTable
Show that mixed type packing density, θ indicate fine grained filler material content, dsIndicate the weight ratio of mixed type filler and water,α indicates that filler material expansion rate, β indicate the filling rate of mixed type filler, β0Indicate mixed
The initial filling rate of mould assembly filler, ρwIndicate that the density of water, w indicate mixed type filler moisture content, GSkeletonIndicate thick in skeleton
Grain accounts for the weight ratio of mixed type filler.
10. the evaluation method described according to claim 6 or 7, which is characterized in that in adjustment expands evaluation height affecting parameters
The expansion effects depth step in,
Height is evaluated using the standard swell increment as presently described expansion, is expanded according to the mixture currently having calculated that
Rate obtains the standard value of corresponding expansion effects depth, and using the standard value as the updated expansion effects depth.
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